[PATCH] D13687: [SCEV] Opportunistically interpret unsigned constraints as signed

[Sanjoy Das via llvm-commits]

sanjoy created this revision.
sanjoy added reviewers: atrick, hfinkel, reames, nlewycky.
sanjoy added a subscriber: llvm-commits.

An unsigned comparision is equivalent to is corresponding signed version
if both the operands being compared are positive.  Teach SCEV to use
this fact when profitable.

http://reviews.llvm.org/D13687

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Transforms/IndVarSimplify/eliminate-comparison.ll

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